Stamberger



y 7, 1959 A. STAMBERGER ELECTROMAGNETIC CARBON-FILE REGULATORS Filed Oct. 22, 1956 United States Patent ELECTROMAGNETIC CARBON-FILE REGULATORS Andrew Stamberger, Brockley, London, England, assignor to J. Stone & Company (Deptford) Limited, Deptford, London, England Application October 22, 1956, Serial No. 617,561

Claims priority, application Great Britain October 26, 1955 3 Claims. (Cl. 338-52) This invention concerns improvements relating to electromagnetic carbon-pile regulators, particularly totally enclosed regulators having the pile and magnet system sealed in an inert atmosphere. In a regulator of this kind described in the specification of application No. 399,794, now Patent No. 2,828,395, for limiting the conduction of heat between the pile and magnet system, the wall of an enclosure closely surrounding the pile is in heat-conducting connection at one end with a casing forming an enclosure for the magnet system solely by way of a tubular extension of the said wall, through which extension a pile-compressing member acts between the mag net system and pile.

In accordance with the present invention, a tubular extension connecting a pile enclosure to a magnet enclosure of an electromagnetic carbon-pile regulator is provided with one or more circumferential corrugations, bellowslike folds or the like. The provision of such one or more corrugations, folds or the like not only further increases appreciably the length, and the obstruction to thermal conduction, of the conducting path between the pile and the magnet system, but also facilitates adjustment of the distance of the fixed pile abutment from the magnet system without deflecting the cover of the casing enclosing the said system.

One manner of carrying the invention into efiect will now be more fully described with reference to the accompanying drawing which shows part of an electromagnetic carbon-pile regulator in axial section.

The drawing illustrates an enclosure arrangement which is generally of the kind described in the aforesaid specification. There is a can-like casing 1 with a domed cover 2 for enclosing the magnet system of the regulator and a tubular enclosure 3 closely surrounding the pile of the regulator. The wall of the enclosure 3 is connected at one end to the cover 2 of the casing 1 by Way of a thinwalled tubular extension 4 from the said wall, the said extension being sealed into both the enclosure 3 and the cover 2. The tubular enclosure 3 is closely embraced by a finned cooling body 5.

For the purposee of the present invention, a circumferential corrugation 6 is formed in the extension 4. The provision of this corrugation further increases appreciably the length and obstruction to thermal conduction of the conducting path between the pile assembly, in which heat is developed during operation of the regulator, and the magnet system in the can 1. It therefore contributes to the avoidance of excessive variation in the temperature of the magnet windings.

As described in the aforesaid specification, the fixed pile abutment, located at the left-hand end of the enclosure 3 in the drawing is connected to the fixed part of the magnet system by a plurality of tie rods 7 which are fast in the end fin 8 of the body 5 and are sealed into the cover 2 where they pass therethrough. One tie rod 7 at least is made adjustable in length for the purpose of adjusting the distance between the fixed abutment and the magnet system. The presence of the corrugation 6 permits such adjustment to be effected without it being essential to make the cover 2 rather flexible, since the corrugation Will readily take up the relative displacement caused by such adjustment.

A bellows-like circumferential fold formation may be employed in place of the corrugation 6 and, if desired, more than one corrugation or fold may be provided.

Only as much of the regulator has been illustrated as is necessary for an understanding of the present invention. For the rest, the regulator may with advantage be constructed and adapted for operation substantially as described and illustrated in the aforesaid specification.

I claim:

1. In an electromagnetic carbon-pile regulator, a tubular pile enclosure Wall, a magnet system, a magnet system housing, a tube extending from one end of said pile enclosure wall and connecting said pile enclosure wall with said system housing, said tubular extension having at least one circumferential corrugation-like formation between said pile enclosure and said system enclosure for increasing the length of the path of heat conduction from said pile enclosure Wall to said system housing.

2. A regulator according to claim 1 and additional means connecting said pile enclosure wall with said system housing, said additional connecting means including at least one tie-rod, said rod having means for the adjustment of its length.

3. An electromagnetic regulator comprising a carbon pile, a magnet system, a pile-compressing member acting between the said system and the said pile, a wall forming an enclosure closely surrounding the pile, a casing forming an enclosure for said magnet system, means supporting said pile enclosure in a position spaced away from the said casing, and a tubular Wall extension which has at least one flexible corrugation in its cylindrical wall and which forms a connecting enclosure part between the said enclosures and through which the said pile-compressing member extends and acts.

References Cited in the file of this patent UNITED STATES PATENTS 2,286,717 Clason June 16, 1942 2,419,491 Gartner Apr. 22, 1947 2,434,425 Muller Jan. 13, 1943 2,457,814 Gordy Jan. 4, 1949 2,481,782 Reichel Sept. 13, 1949 

